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1. 发明申请

WO9606881A3 SINTERABLE SEMI-CRYSTALLINE POWDER AND ARTICLE FORMED THEREWITH 审中-公开
标题翻译：可烧结的半晶体粉末及其形成的物品
公开(公告)号：WO9606881A3
公开(公告)日：1996-05-23
申请号：PCT/US9511006
申请日：1995-08-29
申请人： DTM CORP
发明人： DICKENS ELMER DOUGLAS JR , LEE BIING LIN , TAYLOR GLENN ALFRED , MAGISTRO ANGELO JOSEPH , NG HENDRA , MCALEA KEVIN P , FORDERHASE PAUL F
IPC分类号： C08L101/00 , B29C35/08 , B29C41/00 , B29C67/00 , B29C67/04 , B29K23/00 , B29K77/00 , C08G69/14 , C08J3/12 , C08J9/24 , C08L23/04 , C08L23/10 , C08L23/26 , C08L59/00 , C08L77/00
CPC分类号： C08J3/12 , B29C41/003 , B29C64/153 , B29C67/04 , B29C2035/0838 , B29K2023/00 , B29K2023/06 , B29K2023/12 , B29K2059/00 , B29K2067/006 , B29K2077/00 , B29K2079/00 , B29K2995/0094 , B33Y10/00 , B33Y70/00 , C08J9/24 , Y10S521/919 , Y10S525/902 , Y10T428/249958 , Y10T428/249986 , Y10T428/252
摘要： A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 νm, provided further that the number average ratio of particles smaller than 53 νm is greater than 80 %, the remaining larger particles being in the size range from 53 νm to 180 νm. A powder with slow recrystallization rates, as evidenced by non-overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10 °C to 20 °C per minute, will also result in sintered parts that are near-fully dense, with minimal dimensional distortion.
摘要翻译：已经制备了具有独特性质的激光可烧结粉末产品，其允许粉末在选择性激光烧结机中烧结以形成接近完全致密的烧结部分。对于大多数目的，烧结部分与通过各向同性地成型粉末制成的具有相同尺寸的另一部件是不可区分的。除了在接近其软化温度的温度下可自由流动外，还公开了一种有用的粉末，其具有两层分布，其中基本上没有一次颗粒的平均直径大于180μm，条件是，小于53μm的颗粒大于80％，剩余的较大颗粒的尺寸范围为53μm至180μm。具有缓慢重结晶速率的粉末，其扫描速率在每分钟10℃至20℃的差示扫描量热法特征中不重叠的吸热和放热峰所证明的也将导致烧结部件几乎完全致密，具有最小的尺寸变形。

2. 发明专利

MX9701266A POLVO SEMICRISTALINO SINTERIZABLE Y ARTICULO FORMADO CON EL MISMO. 未知
公开(公告)号：MX9701266A
公开(公告)日：1997-05-31
申请号：MX9701266
申请日：1995-08-29
申请人： DTM CORP
发明人： DICKENS ELMER DOUGLAS , LEE BIING LIN , TAYLOR GLENN ALFRED , MAGISTRO ANGELO JOSEPH , NG HENDRA , MCALEA KEVIN P , FORDERHASE PAUL F
IPC分类号： B29C35/08 , B29C41/00 , C08L101/00 , B29C67/00 , B29C67/04 , B29K23/00 , B29K77/00 , C08G69/14 , C08J3/12 , C08J9/24 , C08L23/04 , C08L23/10 , C08L23/26 , C08L59/00 , C08L77/00 , C08J03/12
摘要： Se ha preparado un producto de polvo sinterizable con laser que tiene propiedades singulares que permite que el polvo se sinterice en una máquina de sinterizacion con láser selectiva para formar una pieza sinterizada que es casi completamente densa. Para la mayoría de los fines, la pieza sinterizada no puede distinguirse de otra pieza que tiene las mismas dimensiones fabricada moldeando isotropicamente el polvo. Además, de fluir libremente a una temperatura cerca de su temperatura de reblandecimiento, se da a conocer un polvo util que tiene una distribucion de dos hileras en donde esencialmente ninguna de las partículas primarias tienen un diámetro promedio mayor de 180 micrometros, siempre que además la relacion promedio en numero de las partículas más pequeñas de 53 micrometros sea mayor del 80 por ciento, las partículas más grandes restantes siendo una escala de tamaño de 53 micrometros a 180 micrometros. Un polvo con regímenes de recristalizacion lentos, como se muestra mediante los valores máximos endotérmico y exotérmico no traslapantes en sus características de calorimetría de exploracion diferencial para régimen de exploracion dentro del orden de 10 degree C a 20 degree C por minuto, también dará por resultado piezas sinterizadas que son casi completamente densas, con distorsion dimensional mínima.

3. 发明专利

CA2234266A1 METHOD OF FORMING ARTICLES USING THERMOSETTING MATERIALS 未知
公开(公告)号：CA2234266A1
公开(公告)日：1997-04-17
申请号：CA2234266
申请日：1996-10-10
申请人： DTM CORP
发明人： BOOTH RICHARD B , MCALEA KEVIN P , LAKSHMINARAYAN UDAYKUMAR
IPC分类号： B22F3/10 , B22F3/105 , B22F3/26 , B29C67/00 , C04B35/622 , C04B35/64 , B29C35/02
摘要： A method of fabricating articles, such as prototype parts and prototype tooling for injection molding, is disclosed. The method begins with the fabrication of the article in a "green" state by the selective laser sintering, or another additive thermal process, applied to a composite powder, preferably a powder of metal particles coated with a thermoplastic polymer. Both the green article and also an aqueous emulsion of a thermosetting material are then preheated to a temperature below the glass transition temperature of the thermoplastic polymer, and the green article is then infiltrated with the aqueous emulsion. The thermosetting material may be a thermosetting polymer with an appropriate cross-linking agent, or may be a cross-linking agent that will react with the thermoplastic binder polymer. After infiltration, the article is dried, and a rigid skeleton of a thermosetting material is now present within the structure of the article. Further processing may now be performed. The article may be heated beyond the decomposition temperature of the polymers so as to drive off the polymer and sinter the metal particles to one another; alternatively, a resin may be added to the article to form a metal-polymer composite article. High strength articles may thus be formed in a manner which preserves the dimensional accuracy of the article relative to its CAD representation.

4. 发明专利

CA2216540A1 COMPOSITE PLASTIC MATERIAL FOR SELECTIVE LASER SINTERING 未知
公开(公告)号：CA2216540A1
公开(公告)日：1996-10-03
申请号：CA2216540
申请日：1996-03-29
申请人： DTM CORP
发明人： KUNIG FREDERIC W , GANNINGER MARK E , MCALEA KEVIN P , FORDERHASE PAUL F , MAGISTRO ANGELO J
IPC分类号： C08J9/24 , B29C39/00 , B29C41/00 , B29C67/00 , B29C67/20 , B29K105/04 , C08J9/32 , C08K7/20 , C08L77/00 , C08L101/00
摘要： A composite powder specially adapted for use in selective laser sintering is disclosed. The composite powder includes a polymer powder dry mixed with a reinforcement powder, where the polymer powder has a melting temperature substantially lower than that of the reinforcement powder. In the case where near-fully dense parts are to be formed, the first constituent powder is preferably a semi-crystalline powder, for example nylon 11, of a composition suitable for forming near-fully dense parts when used unblended in selective laser sintering; if porous parts are desired, the polymer powder is an amorphous powder, such as polycarbonate, polystyrene, acrylates, and styrene/acrylate copolymers. The reinforcement powder is preferably microspheres of glass, preferably coated to enhance wetting and adhesion with the polymer powder when selective laser sintering is performed. Besides improving the stiffness and heat resistance of the part produced, the composite powder widens the process window over that provided by unblended powder, provides improved dimensional accuracy in the part produced, and facilitates rough breakout and smooth finishing of the part produced.

5. 发明专利

AT192055T 未知
公开(公告)号：AT192055T
公开(公告)日：2000-05-15
申请号：AT96937673
申请日：1996-10-10
申请人： DTM CORP
发明人： LAKSHMINARAYAN UDAYKUMAR , MCALEA KEVIN P , BOOTH RICHARD B
IPC分类号： B22F3/10 , B22F3/105 , B22F3/26 , B29C67/00 , C04B35/622 , C04B35/64
摘要： A method of fabricating articles, such as prototype parts and prototype tooling for injection molding, is disclosed. The method begins with the fabrication of the article in a "green" state by the selective laser sintering, or another additive thermal process, applied to a composite powder, preferably a powder of metal particles coated with a thermoplastic polymer. Both the green article and also an aqueous emulsion of a thermosetting material are then preheated to a temperature below the glass transition temperature of the thermoplastic polymer, and the green article is then infiltrated with the aqueous emulsion. The thermosetting material may be a thermosetting polymer with an appropriate cross-linking agent, or may be a cross-linking agent that will react with the thermoplastic binder polymer. After infiltration, the article is dried, and a rigid skeleton of a thermosetting material is now present within the structure of the article. Further processing may now be performed. The article may be heated beyond the decomposition temperature of the polymers so as to drive off the polymer and sinter the metal particles to one another; alternatively, a resin may be added to the article to form a metal-polymer composite article. High strength articles may thus be formed in a manner which preserves the dimensional accuracy of the article relative to its CAD representation.

6. 发明专利

MX9707363A MATERIAL DE PLASTICO COMPUESTO PARA SINTERIZACION DE LASER SELECTIVA. 未知
公开(公告)号：MX9707363A
公开(公告)日：1998-02-28
申请号：MX9707363
申请日：1996-03-29
申请人： DTM CORP
发明人： MCALEA KEVIN P , FORDERHASE PAUL F , GANNINGER MARK E , KUNING FREDERIC W , MAGISTRO ANGELO J
IPC分类号： C08J9/24 , B29C39/00 , B29C41/00 , B29C67/00 , B29C67/20 , B29K105/04 , C08J9/32 , C08K7/20 , C08L77/00 , C08L101/00 , C08J03/20
摘要： Se da a conocer un polvo compuesto adaptado especialmente para usarse en la sinterizacion de láser selectiva. El polvo compuesto incluye un polvo polimérico mezclado en seco con un polvo de refuerzo, en donde el polvo polimérico tiene una temperatura de fusion considerablemente menor que aquélla del polvo de refuerzo. En el caso en donde van a formarse piezas casi completamente densas, el primer polvo constituyente de preferencia es un polvo semicristalino, por ejemplo, nylon 11 de una composicion apropiada para formar piezas casi completamente densas cuando se usa sin combinar en la sinterizacion de láser selectiva; si se desean piezas porosas, el polvo polimérico es un polvo amorfo tal como policarbonato, poliestireno, acrilatos, copolímeros de estireno/acrilato. El polvo de refuerzo está constituido de preferencia de microesferas de vidrio, de preferencia revestidas para mejorar el humedecimiento y adhesion con el polvo polimérico cuando se lleva a cabo la sinterizacion de láser selectiva. Además de mejorar la rigidez y resistencia al calor de la pieza producida, el polvo compuesto amplía la ventana del proceso en relacion con aquélla que se proporciona mediante el polvo no combinado, proporciona exactitud dimensional mejorada en la pieza producida y facilita el desprendimiento brusco y el acabado liso o uniforme de la pieza productiva.

7. 发明专利

CA2244754A1 POLYMER POWDER OF CONTROLLED PARTICLE SIZE DISTRIBUTION 未知
公开(公告)号：CA2244754A1
公开(公告)日：1997-08-14
申请号：CA2244754
申请日：1997-02-06
申请人： DTM CORP
发明人： BOOTH RICHARD B , FORDERHASE PAUL F , MCALEA KEVIN P
IPC分类号： B29C67/00 , C08J3/12 , B29C67/02
摘要： A powder for use in selective laser sintering, from which prototype articles and masters for molds may be formed, is disclosed. The powder is formed by spray drying a polymer emulsion to yield a distribution of particles of substantially spherical shape. The powder is then air classified to remove excessively small particles from the distribution; the powder may also be screened to remove large particles therefrom, as well. The resulting distribution of particles sizes, by volume, preferably has a mean particle size of between about 20.mu. and about 50.mu., with preferably less than about 5 % (by volume) of its particles with a size of less than about 15.mu. and less than about 2 % (by volume) of its particles with a size of greater than about 75.mu.. The powder is subjected to selective laser sintering to produce an article of approximately 55 % to 75 % of theoretical density. The article may be used as a prototype article or part, or as a pattern or master for a mold.

8. 发明专利

AU5436296A Composite plastic material for selective laser sintering 未知
公开(公告)号：AU5436296A
公开(公告)日：1996-10-16
申请号：AU5436296
申请日：1996-03-29
申请人： DTM CORP
发明人： MCALEA KEVIN P , FORDERHASE PAUL F , GANNINGER MARK E
IPC分类号： C08J9/24 , B29C39/00 , B29C41/00 , B29C67/00 , B29C67/20 , B29K105/04 , C08J9/32 , C08K7/20 , C08L77/00 , C08L101/00 , C08J3/20
摘要： A composite powder specially adapted for use in selective laser sintering is disclosed. The composite powder includes a polymer powder dry mixed with a reinforcement powder, where the polymer powder has a melting temperature substantially lower than that of the reinforcement powder. In the case where nearfully dense parts are to be formed, the first constituent powder is preferably a semi-crystalline powder, for example nylon 11, of a composition suitable for forming near-fully dense parts when used unblended in selective laser sintering; if porous parts are desired, the polymer powder is an amorphous powder, such as polycarbonate, polystyrene, acrylates, and styrene/acrylate copolymers. The reinforcement powder is preferably microspheres of glass, preferably coated to enhance wetting and adhesion with the polymer powder when selective laser sintering is performed. Besides improving the stiffness and heat resistance of the part produced, the composite powder widens the process window over that provided by unblended powder, provides improved dimensional accuracy in the part produced, and facilitates roughbreakout and smooth finishing of the part produced.

9. 发明专利

AT211439T 未知
公开(公告)号：AT211439T
公开(公告)日：2002-01-15
申请号：AT96911486
申请日：1996-03-29
申请人： DTM CORP
发明人： MCALEA KEVIN P , FORDERHASE PAUL F , GANNINGER MARK E
IPC分类号： C08J9/24 , B29C39/00 , B29C41/00 , B29C67/00 , B29C67/20 , B29K105/04 , C08J9/32 , C08K7/20 , C08L77/00 , C08L101/00 , C08J3/20
摘要： A composite powder specially adapted for use in selective laser sintering is disclosed. The composite powder includes a polymer powder dry mixed with a reinforcement powder, where the polymer powder has a melting temperature substantially lower than that of the reinforcement powder. In the case where nearfully dense parts are to be formed, the first constituent powder is preferably a semi-crystalline powder, for example nylon 11, of a composition suitable for forming near-fully dense parts when used unblended in selective laser sintering; if porous parts are desired, the polymer powder is an amorphous powder, such as polycarbonate, polystyrene, acrylates, and styrene/acrylate copolymers. The reinforcement powder is preferably microspheres of glass, preferably coated to enhance wetting and adhesion with the polymer powder when selective laser sintering is performed. Besides improving the stiffness and heat resistance of the part produced, the composite powder widens the process window over that provided by unblended powder, provides improved dimensional accuracy in the part produced, and facilitates roughbreakout and smooth finishing of the part produced.

10. 发明专利

AU709822B2 Sinterable semi-crystalline powder and article formed therewith 未知
公开(公告)号：AU709822B2
公开(公告)日：1999-09-09
申请号：AU3460995
申请日：1995-08-29
申请人： DTM CORP
发明人： DICKENS ELMER DOUGLAS JR , LEE BIING LIN , TAYLOR GLENN ALFRED , MAGISTRO ANGELO JOSEPH , NG HENDRA , MCALEA KEVIN P , FORDERHASE PAUL F
IPC分类号： C08L101/00 , B29C35/08 , B29C41/00 , B29C67/00 , B29C67/04 , B29K23/00 , B29K77/00 , C08G69/14 , C08J3/12 , C08J9/24 , C08L23/04 , C08L23/10 , C08L23/26 , C08L59/00 , C08L77/00
摘要： A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 mu m, provided further that the number average ratio of particles smaller than 53 mu m is greater than 80%, the remaining larger particles being in the size range from 53 mu m to 180 mu m. A powder with slow recrystallization rates, as evidenced by non-overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10 DEG C. to 20 DEG C. per minute, will also result in sintered parts that are near-fully dense, with minimal dimensional distortion.

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